S-123T

Overview

The Semitec USA Corp S-123T is a surface-mount current regulating diode (CRD) designed to maintain a constant current flow despite voltage fluctuations. It operates within a wide voltage range from less than 1V to 100V and delivers a typical pinch-off current of 12.0 mA, with a minimum of 9.60 mA and a maximum of 14.4 mA at 10V. The device features a maximum limiting voltage of 3.8V and supports a rated power of 500mW. It functions reliably across an operating temperature range of -40°C to 150°C and is housed in a compact SMD package.

Feature Summary

• Maintains constant current output regardless of applied voltage or load resistance changes
• Simplifies circuit design by replacing multiple components with a single part for constant current generation
• Operates effectively over a wide voltage range from under 1V up to 100V

Applications

• Constant current source for LED brightness stabilization
• Battery charge and discharge circuits
• Current source for proximity sensors and other sensors
• Stabilized power supply circuits

Procurement Notes

Verify the specific ordering suffix 'T' confirms the SMD reel taping format required for surface mount assembly. Confirm that the component meets RoHS3 compliance standards if environmental regulations apply to the final product. Ensure the selected variant matches the required 500mW power rating and 100V maximum voltage specifications for the intended application environment.

Selection Notes

Select the S-123T when a nominal 12mA constant current is required for surface mount designs. Consider the -40°C to 150°C operating range for high-temperature environments. For higher currents, multiple units can be arranged in rows. Use recommended parallel resistors to compensate for current reduction due to self-heating effects during operation.

Part Context

The S-123T belongs to the S series of current regulating diodes from Semitec USA Corp. This series is characterized by a 500mW rated power and a wider operating temperature range compared to the axial E series. The S series utilizes surface mount technology, offering space-saving benefits for modern electronic assemblies while maintaining the reliability and performance characteristics of the brand's CRD portfolio.

Replacement Considerations

The datasheet lists the E-123 as the leaded equivalent. No other direct substitute part numbers are documented in the provided material.